Modified True/False
Indicate
whether the statement is true or false. If false, change the identified word or phrase to make the
statement true.
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1.
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Whether an object sinks or floats depends on the volume of the object.
_______________
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2.
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If a woman changes from running shoes to high heels, she decreases the
pressure exerted on the ground. _______________
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3.
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The pressure a fluid exerts on an object is always parallel to the
surface of the object. _______________
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4.
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If you dive headfirst into a swimming pool, the pressure on your head is more
than the pressure on your feet. _______________
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5.
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The buoyant force acts in all directions. _______________
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6.
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The greater the surface area of an object, the greater the buoyant force.
_______________
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7.
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Pascal's principle explains hydraulic systems.
_______________
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8.
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Pascal's principle deals with fluid at rest. _______________
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Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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Pressure applied by a fluid _____ with depth.
a. | increases | c. | may increase or decrease | b. | remains
constant | d. | decreases |
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2.
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The average atmospheric pressure at sea level is _____.
a. | 100 Pa | c. | 10,000 Pa | b. | 1000 Pa | d. | 100,000 Pa |
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3.
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Lisa determines that a piece of an unknown material has a mass of 3.0 g and a
volume of 8.0 cm3. What is the density of the material?
a. | 24.0 g/cm3 | c. | 11.0 g/cm3 | b. | 5.0
g/cm3 | d. | 0.4
g/cm3 |
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4.
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Buoyant forces act on an object in a _____.
a. | solid | c. | gas | b. | liquid | d. | liquid or a gas |
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5.
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The buoyant force on an object is dependent on _____.
a. | the object’s density | c. | the volume of the
object | b. | the mass of the object | d. | the shape of the object |
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6.
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The buoyant force on an object is in the _____ direction.
a. | upward | c. | sideways | b. | downward | d. | backwards |
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7.
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Fred is using two different straws to drink his juice. Straw A is larger than
Straw B. Which of the following is more likely?
a. | Juice will flow more slowly in Straw A. | b. | Juice will flow more
slowly in Straw B. | c. | Juice flows at the same rate through
both. | d. | None of the above. |
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8.
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Drag force acts to decrease the _____ of an object moving through a
fluid.
a. | force | c. | energy | b. | motion | d. | temperature |
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9.
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As an object sinks in a fluid, the buoyant force ____.
a. | increases | c. | remains the same | b. | decrease | d. | depends on the
shape |
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Completion
Complete each
statement.
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1.
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A force of 20 N exerted over an area of 0.5 m2 exerts a pressure of
____________________.
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2.
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The ____________________ is an upward force exerted by a fluid on any object in
the fluid.
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3.
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The density of water is ____________________.
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4.
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Any material with a density ____________________ than water will float in
water.
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5.
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The pressure a fluid in a closed container exerts can be increased by
____________________.
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6.
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A hydraulic system uses a(n) ____________________ to transmit pressure.
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7.
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A beaver dam needs to be _______________ at the bottom than it is at the top
because the pressure of the water is _______________ at lower depths.
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8.
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When an object is pushed under water, it _______________ an equal volume of
water.
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9.
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A baseball pitcher can curve a baseball by spinning it because
_______________.
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10.
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_______________ is what slows a jumper down when her parachute opens. She then
can control her descent by changing the shape of her parachute.
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Matching
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Match the term with the appropriate statement. a. | Archimedes | b. | Bernoulli | c. | Density | d. | Pascal | e. | Pressure |
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1.
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a balloon expands in all directions when inflated
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2.
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a boat floats in water
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3.
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a concrete block sinks
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4.
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can cause a roof to lift off a house
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5.
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can determine weight of an object
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6.
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causes a curve ball in baseball
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7.
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force divided by area
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8.
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hydraulic lift
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9.
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mass divided by volume
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10.
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squeezing the bottom of a plastic ketchup bottle causes ketchup to come out the
top
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11.
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water moves faster in a smaller tube
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Short Answer
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1.
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How are force and pressure different?
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2.
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Explain how a buoyant force occurs.
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3.
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If you push a block of wood under the water, you feel a force on your hand.
Explain.
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4.
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Which has a greater mass, a kilogram of feathers or a kilogram of iron? Which
has a greater density? Explain.
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5.
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A canoe displaces 100 L of water. Water weighs 9.8 N/L. What is the buoyant
force on the canoe?
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6.
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Alcohol has a lower density than water. Would you expect wood to float in
alcohol with more or less volume above the surface than in water? Explain.
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7.
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Explain why dishwashing detergent comes out of the top of the bottle when the
bottle's sides are squeezed.
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